CLINICAL TRIAL / NCT05653349

Inclusion Criteria: - Signed informed consent prior to participation in the study. - Male or female participants aged 18 years and older on the day of signing informed consent - Primary ITP diagnosed within 3 months before initiating first-line ITP therapy (corticosteroids, IVIG) - Platelet count below 30 G/L before starting any first-line ITP therapy (corticosteroids, IVIG) - Response (platelet count >=50 G/L) to corticosteroids (+/- IVIG) at any time prior to randomization. Note: Platelet count measured within 7 days of platelet transfusion will not be considered as response. Key Exclusion Criteria: - Evans syndrome or any other cytopenia (patients with anemia related to bleeding or iron deficiency are eligible) - Current life-threatening bleeding - Previous ITP treatment, including splenectomy, except for corticosteroids and/or IVIG initiated as first-line therapy for up to 28 days before randomization and rescue corticosteroids and/or IVIG given prior to confirmed diagnosis of primary ITP . - Prior use of B-cell depleting therapy (e.g., rituximab). - Absolute neutrophil count below 1.0 G/L at randomization - Participants with concurrent coagulation disorders and/or receiving anti-platelet or anticoagulant medication with an exemption of low dose of acetylsalicylic acid Other protocol-defined Inclusion/Exclusion may apply.